﻿<html lang="en">
<head>
<meat charset="utf-8">
<title>学会导行</title>
<style type="text/css">
  *{
     margin :0;
     padding:0;
     }
   .headder {
       widgth:100%;
      heght:50px;
      background:ffffff;
     box-shadow:0 2px 7px rght(31,39,48,0.51);
     }
   .logo {
    float:left;
    width:91px;
    padding:10px 0 0 20px;
    }
</style>
</head>
<boty>
<div class="header">
<div class="logo">
<img alt="logo" src="img/study_long.png"/>
</div>
</boty>
</html>